president obama then addressed the nation. >> boston police and state police and local police across the commonwealth of massachusetts responded with professionalism, and bravery over five long days. and tonight, because of their determined efforts, we've closed an important chapter in this tragedy. >> now, the other suspect that's dzhokhar's older brother, 26-year-old tamerlan tsarnaev was killed friday during a confrontation with police. authorities in boston suspended all mass transit friday and warned roughly 1 million people to stay indoors as the hunt for the remaining suspect played out. the brothers are the suspects in monday's marathon -- boston rather marathon bombings that killed three people and injured more than 180 others. the men are also suspected of killing an m.i.t. police officer while sitting in his vehicle friday night. let's go to watertown. nbc's luke russert is outside the hospital where the suspect is right now. good morning to you. take us through exactly how this 19-year-old suspect was caught? what are the details you've learned about how all this went dow